JP2003292280A - Apparatus and method for diagnosing slack quantity of driving chain for passenger conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and method for diagnosing the slack quantity of a driving chain 9 for a passenger conveyor dissolving the inconvenience of users while eliminating work at an installation site of the passenger conveyor by automatically measuring and diagnosing the slack quantity α of the driving chain 9. <P>SOLUTION: A drive motor is rotated in one direction with its driving force lower than the driving force required to start a main drive sprocket 5, to strain one side of the driving chain 9, and the rotating position of the drive motor 120 at this time is made a starting point s1. The drive motor 10 is then rotated in the other direction to strain the other side of the driving chain 9, and the rotating position of the drive motor 10 at this time is made an end point s2. The slack quantity α of the driving chain 9 is computed from the number of rotation s of the drive motor 10 rotated from the starting point s1 to the end point s2, and an abnormality signal is outputted when the slack quantity αexceeds a prescribed value δ1 or δ2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for diagnosing the amount of slack in a drive chain that drives a passenger conveyor.

[0002]

Chains are used throughout passenger conveyors. This chain stretches and loosens as it is used. If the chain becomes too loose, backlash will increase, which is not desirable. Therefore, it is necessary that the chain is stretched so as to always have a predetermined amount of slack. Therefore, in the passenger conveyor, the chain is shaken in a direction orthogonal to the direction in which the middle part of the chain is stretched, its amplitude is measured, and the measured value is maintained within a predetermined range.

FIG. 6 is a vertical cross-sectional view of an escalator showing a measurement of a slack amount of a conventional drive chain of the escalator of the passenger conveyor. That is, a step chain 3 that circulates the steps 2 is wound around a step chain sprocket 4 around the escalator 1 placed on the beam of the building. A main drive sprocket 5 is attached coaxially with the step chain sprocket 4. A drive machine sprocket 8 is attached to the output shaft 7 of the drive machine 6, and a drive chain 9 is wound around the drive machine sprocket 8 and the main drive sprocket 5. Further, the drive motor 6 is attached to the rotary shaft 11 of the drive motor 10.
The input shaft and the brake 12 are directly connected.

Therefore, in order to circulate the steps 2, the brake 12 is opened and the drive motor 6 drives the drive motor 6 to drive the drive sprocket 8 attached to the output shaft 7.
Is rotated, the drive chain 9 is circulated, and the main drive sprocket 5 is rotated. The step chain sprocket 4 mounted coaxially with the main drive sprocket 5 rotates to circulate the step chain 3 and the step 2.

In order to measure the slack of the drive chain 9 of the escalator, first, the floor plate 18 covering the machine room is removed, the circuit breaker 17 attached to the control panel 16 is opened, and the power circuit of the drive motor 10 is opened. Shut off. Brake 12
After manually opening the
The rotation shaft 11 is rotated to tension the upper drive chain 9 so that the main drive sprocket 5 is on the verge of starting to move, and the lower drive chain 9 is loosened, and the brake 12 stops the drive machine 6. The middle part of the lower drive chain 9 is swung up and down, and its amplitude α is measured and used as the amount of slack. If the slack amount α is out of the predetermined range, the mounting bolt 15
Is loosened and the machine base 14 is moved back and forth, and the mounting bolt 15 is tightened so that the slack amount α is within a predetermined range. Further, Japanese Utility Model Laid-Open No. 64-18083 discloses a device for measuring the amount of slack in the middle part of the upper drive chain 9.

[0006]

As described above, the measurement of the amount of slack in the drive chain of the conventional passenger conveyor is as follows.
After removing the floor plate 18 into the machine room and operating the circuit breaker 17 to shut off the power, the brake 12 is opened and the manual winding handle 13 is turned to tension one side of the drive chain 9 and loosen the other side. Let The drive chain 9 on the loosened side was swung up and down, and its amplitude was measured. Since each operation is performed manually, there is a problem that it is troublesome and troublesome. Further, since the passenger conveyor has to be stopped, there is a problem that the passengers are inconvenient while measuring the amount of slack of the drive chain.

The present invention has been made to solve the above-mentioned problems, and automatically measures the amount of slack in the drive chain to make a diagnosis, omits the work at the installation site of the passenger conveyor, and utilizes it. The purpose is to eliminate inconvenience to customers.

[0008]

[Means for Solving the Problems] Claim 1 according to the present invention
The passenger conveyor drive chain slack amount diagnosing device described in (1) is one side of the drive chain in which the drive force of the drive motor is rotated in one direction with a drive force lower than the drive force required to start the main drive sprocket. The start position is the rotational position of the drive motor at this time, then the drive motor is rotated in the other direction to tension the other side of the drive chain, and the rotational position of the drive motor at this time is set as the end point. The slack amount of the drive chain is calculated from the number of rotations of the drive motor between the start point and the end point, and an abnormal signal is issued when the slack amount exceeds a predetermined value.

According to a second aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, when the operation switch for instructing the passenger conveyor to operate the normal operation is operated, the normal operation is performed. The start point and the end point are set prior to the operation, and the slack amount is calculated.

According to a third aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. When the operating switch for instructing the passenger conveyor to perform a normal operation is operated, the normal operation is performed. Before setting the start point by rotating the drive motor rotation direction with a low drive force in the direction opposite to the normal operation direction specified by the operation switch, set the start point by the operation switch. The amount of slack is calculated by switching to the designated direction and setting the end point.

According to a fourth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor, according to the first aspect, wherein the stop detection means causes the drive motor to be started by the start point setting operation means or the end point setting operation means. After that, the elapse of a predetermined time limit is detected, and this detection is detected as a stopped state.

According to a fifth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor according to the first aspect, wherein the stop detection means has a predetermined pulse generation interval generated by the rotation of the drive motor. The fact that the time limit has been exceeded is detected, and this detection is made to be the detection of the stopped state.

According to a sixth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, the stop detection means detects the restraining current of the drive motor, and the detection is stopped. This is the detection of the state.

According to a seventh aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor, wherein the start point and the end point are replaced with the rotational position of the drive motor, and the rotation of the drive sprocket is changed. The slack amount of the drive chain is calculated as the moving position.

According to an eighth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, the abnormality signal is sent to a management center for centrally managing the passenger conveyor. .

According to a ninth aspect of the present invention, there is provided a method for diagnosing a slack in a drive chain of a passenger conveyor, wherein the drive motor is rotated in one direction with a driving force lower than that required to start the main drive sprocket. The tension on one side of the drive chain, starting at the point where the drive motor stopped, then rotating the drive motor in the other direction to tension the other side of the drive chain and ending at the point where the drive motor stopped. Then, the slack amount of the drive chain is calculated from the number of rotations from the start point to the end point, and when the slack amount exceeds a predetermined value, an abnormal signal is issued.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 4 show
1 shows a slack amount diagnosing device for a drive chain of a passenger conveyor according to Embodiment 1 of the present invention, in particular, an example used for an escalator. FIG. 1 is a block diagram showing a configuration of a slack amount diagnosis device for a drive chain of an escalator. In the figure,
1 is an escalator, 2 is a step, 3 is a step chain in which the step 2 is locked and circulates, 4 is a step chain sprocket on which the step chain 3 is wound, and 5 is a main drive mounted coaxially with the step chain sprocket 4. It is a sprocket.

Reference numeral 6 denotes a driving machine for driving the escalator 1, and 7
Is an output shaft of the drive machine 6, 8 is a drive machine sprocket attached to the output shaft 7, 9 is a drive chain wound around the drive machine sprocket 8 and the main drive sprocket 5, and 10 is a drive motor for driving the drive machine 6. , 11 are rotary shafts of the drive motor 10 directly connected to the input shaft of the drive machine 6, and 12 is a brake attached to the rotary shaft 11. Reference numeral 19 is a rotary plate having slits formed along the outer periphery and attached to the rotary shaft 11 to rotate, and 20 is a pulse counter for counting the intermittent light projected onto the rotary plate 19 and passing through the slits, for a unit time. The speed of the rotating shaft 11 is detected from the number of pulses per hit, and the drive motor 10 is detected by the count value obtained by integrating the pulses.
The rotation position of is specified.

Reference numeral 21 is a diagnostic operation command means for instructing an operation for diagnosing the amount of slack of the drive chain 9, and 22 is a drive force of the drive motor 10 lower than a drive force required to start the main drive sprocket 5. A driving force reducing means for reducing the value to a value 23 is a starting point setting for stopping the driving electric motor 10 in one direction by the driving force reduced by the driving force reducing means 22 to rotate the driving electric motor 10 in one direction. Driving means, 24 is a stop detection means for detecting the stop state of the drive motor 10, and 25 is a drive motor 1 when the stop detection means 24 detects the stop state in the operation by the start point setting drive means 23.
Starting point reading means for reading the turning position of 0 as the starting point s1,
Reference numeral 26 is a rotation direction switching means for switching the rotation direction of the drive motor 10 to rotate in the other direction, and 27 is the other side of the drive chain 9 for rotating the drive motor 10 in which the rotation direction is switched in the other direction. When the stop detection means 24 detects the stop state in the operation by the end point setting drive means 27, the drive electric motor 10
End point reading means for reading the rotational position of the end point as the end point s2, 2
Reference numeral 9 is a slack amount calculation means for calculating a slack amount α of the drive chain 9 from the number of rotations s of the drive motor 10 rotated between the start point s1 and the end point s2, and 30 is a slack amount α from a predetermined value δ1 to δ2. It is a transmitting means that emits an abnormal signal when it goes out of the range.

FIG. 2 is an electric circuit connection diagram and shows the same parts as those in FIG. Reference numeral 31 is a circuit breaker for shutting off the power supply circuit of the drive motor 10, and 32 is a converter configured by a thyristor for converting three-phase alternating current into direct current, which changes the direct current voltage Ed by controlling the firing angle of the thyristor. 33
Is a smoothing circuit including a reactor and a capacitor, 34 is a resistor that consumes power, and 35 is a switching transistor, which together with the resistor 34 constitutes a brake circuit that suppresses an increase in DC voltage. Reference numeral 36 is an inverter composed of an anti-parallel circuit of six sets of transistors and diodes, which can convert DC into three-phase AC with variable voltage and variable frequency according to the ON / OFF timing of the transistors. 37 is a trigger circuit for igniting the gate of the converter 32, 38
Is a base drive circuit for ON / OFF controlling the transistor of the inverter 36, and 39 is a base drive circuit for ON / OFF controlling the switching transistor 35.

Reference numeral 41 denotes an operation switch for instructing the passenger conveyor to perform a normal operation, which comprises a stop switch 41s, an UP operation switch 41u, and a DOWN operation switch 41d. A safety circuit 42 checks the safety of the escalator 1 and is connected to the stop switch 41s. Reference numeral 43 is a switch which is connected to the safety circuit 42 to operate and stop the escalator 1, 43a is a main contact of the switch 43, and 43b
Is a normally open auxiliary contact of the switch 43.

Reference numeral 51 is a CPU, 52 is a bus line connected to the CPU 51, and 53 is a RO in which a program is stored.
M and 54 are RAMs for storing temporary data, 55 is a normal operation speed pattern table composed of ROMs for storing speed patterns when the escalator 1 is normally operated, and 56 is for measuring the amount of slack of the drive chain 9. A diagnostic operation speed pattern table including a ROM in which operation speed patterns are stored, 57 is an input / output device for exchanging signals with an external device, and 58 is a slack amount α of the drive chain 9 exceeding a predetermined value δ2. Alternatively, 59 is a signal lamp that lights up when the value falls below the predetermined value δ1, and 59 is a communication device that issues an abnormal signal to the maintenance management center 61 via the telephone line 60 when the slack amount α exceeds the predetermined value δ2 or falls below the predetermined value δ1. Is.

Next, the operation will be described with reference to FIGS. FIG. 3 is a flow chart showing the operation in the case of diagnosing the slack amount α of the drive chain 9 prior to the normal operation of the escalator 1, and FIG. 4 is an explanatory diagram showing the operation of the main parts involved in the processing of FIG. In step S11, it is checked whether the operation switch 41 has been operated. When operated, the output voltage Ed of the converter 32 is reduced in step S12 and becomes the output voltage Ed1 as shown in FIG. 4 (a). Therefore, the inverter 36
Output voltage is suppressed and drive motor 10 is limited to generate a driving force lower than the driving force required to start main drive sprocket 5.

When the UP operation switch 41u is operated in step S13, the process proceeds to step S14 and the inverter 36
The base drive circuit 38 is controlled so that the drive motor 10 rotates in the DOWN direction according to the diagnostic operation speed pattern Vp1 shown in FIG. Drive motor 10
As shown in FIG. 4C, the engine starts in the DOWN direction at time t0 and reaches the speed Vmd1. At time t1, the lower side of the drive chain 9 is strained and the upper side is relaxed, and then stopped.
The state of the same time period shown in FIG. Step S15
Check whether the time limit τ has elapsed from the starting time t0. This time limit τ is preset as a time sufficient for the drive sprocket 8 to tension the drive chain 9 in the diagnostic operation. If the time has not passed, the process waits for the time to go to step S16, and the count value of the pulse counter 20 is stored as the starting point s1.

In step S17, the drive motor 10 is turned on at time t2.
In order to rotate in the UP direction according to the diagnostic operation speed pattern Vp1 shown in FIG.
8 is controlled. As shown in FIG. 4C, the drive motor 10 starts in the UP direction from the time t2, and the speed Vmu1
Becomes At time t3, the upper side of the drive chain 9 is tensioned and the lower side is relaxed and stopped, resulting in the same time zone state as shown in FIG. 4 (d). In step S18, it is checked whether the time limit τ has elapsed from the starting time t2. If the time has not passed, the process waits for the time to go to step S19, and the count value of the pulse counter 20 is stored as the end point s2.

In step S20, the number of rotations s (= s2-s) of the drive motor 10 rotated between the start point s1 and the end point s2.
1) is calculated. This rotation number s is an integrated value,
As shown in (c), it corresponds to the area surrounded by t2-Vmu1-t3-t2. Further, the slack amount α of the drive chain 9 is calculated from the number of rotations s. Here, as a calculation method of the slack amount α, for example, in FIG. 6, the height can be calculated by calculating the height of an isosceles triangle whose base is the span of the main drive sprocket 5 and the drive machine sprocket 8.

It is normal when the slack amount α is smaller than the upper limit predetermined value δ2 and larger than the lower limit predetermined value δ1.
After step S21 and step S22, the process proceeds to step S23, and at time t4 in FIG. 4, the output voltage Ed of the converter 32 is Ed1.
To Ed2 in a stepwise manner, and normal operation is started in the UP direction instructed by the operation switch 41. If the slack amount α is larger than the upper limit predetermined value δ2 or smaller than the lower limit predetermined value δ1, both are abnormal, and the signal lamp 58 is turned on in step S24, and the maintenance management center 61 is also notified. .

Next, in step S13, when the operation switch 41 operates the DOWN operation switch 41d, the process proceeds to step S25 and the base drive circuit 3 of the inverter 36 is operated.
8 is controlled so that the drive motor 10 rotates in the UP direction according to the diagnostic operation speed pattern Vp1. The drive motor 10 starts in the UP direction and stops when the upper side of the drive chain 9 is strained and the lower side is relaxed. In step S26, it is checked whether the time limit τ has elapsed from the starting time. If the time has not elapsed, the process waits for the time to move to step S27, and the count value of the pulse counter 20 is stored as the starting point s1.

In step S28, the base drive circuit 38 is controlled so that the drive motor 10 rotates in the DOWN direction according to the diagnostic operation speed pattern Vp1. The drive motor 10 starts in the DOWN direction and stops in a state where the lower side of the drive chain 9 is strained and the upper side is relaxed. Step S29
Check if the time limit τ has elapsed from the start time. If the time has not passed, the process waits for the time to go to step S19, and the count value of the pulse counter 20 is stored as the end point s2. After that, the processing from step S19 to step S23 is performed. In the first embodiment, the diagnostic operation is performed by the operation switch 41 based on the instruction of the normal operation. Therefore, in step S11, if the operation switch 41 is not operated, the diagnostic operation is not performed and the process ends.

According to the first embodiment, the drive motor 1
The drive force of 0 is reduced to a low value at which the main drive sprocket 5 does not start, and the drive motor 10 is rotated until it is stopped to one side to tension one side of the drive chain 9, and then the rotation direction is switched. Then, the slack amount α of the drive chain 9 is calculated from the number of rotations s of the rotation shaft 11 of the drive motor 10 rotated during that time until the other side of the drive chain 9 is tensioned by rotating the drive chain 9 until it is stopped in the opposite direction. However, when the amount of slack α deviates from a predetermined range, it is reported as an abnormality.
Therefore, the slack amount α can be diagnosed without going to the site where the escalator is installed, and the site work such as removing the floor plate 18 and entering the machine room can be omitted.
Further, since the diagnosis of the slack amount α of the drive chain 9 is performed prior to the normal operation, the user is not inconvenienced. Further, after the drive motor 10 is rotated in the direction opposite to the normal driving direction instructed by the operation switch 41 to specify the start point s1, it is rotated in the forward direction to specify the end point s2. Therefore, it is possible to shift from the diagnostic operation to the normal operation with the drive chain 9 in a tensioned state, and it is possible to reduce the backlash at the start of the normal operation.
Furthermore, since the notification is made when the amount of slack α is smaller than the predetermined value δ1, it is possible to detect improper installation.

Embodiment 2. In the second embodiment, another embodiment in place of the constituent elements disclosed in the first embodiment will be described as an example. Example 1. In the first embodiment, the starting point reading unit 25 and the end point reading unit 28 are configured to attach the rotary plate 19 to the rotary shaft 11 and read the rotary position of the drive motor 10. However, here, the rotary plate 19 is used.
Is attached to the output shaft 7 to read the rotational position of the drive sprocket 8. With this configuration as well, the slack amount α of the drive chain 9 can be similarly calculated, and the backlash of the speed reducer of the drive machine 6 can be eliminated.

Example 2. In the first embodiment, the starting point s
The reading timing of 1 and the end point s2 is set to the time when the time limit τ elapses, but here it is driven when it is detected that the generation interval of the pulses generated by the rotating plate 19 exceeds the predetermined time limit Tsh. The starting point s1 and the ending point s2 are read assuming that the electric motor 10 has stopped. That is, in FIG. 5, the drive motor 10 is shown in FIG.
If the operation is performed as shown in (1), a pulse is generated by the rotating plate 19 as shown in (b). Since the pulse interval is short and short, the time limit Tsh can be short and short, and the stopping of the drive motor 10 can be detected quickly.

Example 3. As yet another embodiment of the read timing of the start point s1 and the end point s2, as shown in FIG. 5C, when the drive motor 10 is stopped, the constraint current I
s flows. Since this constraint current Is is larger than the maximum current Imd or Imu when the drive motor 10 starts according to the diagnostic operation speed pattern Vp1, a threshold value Ish is provided between the constraint current Is and the maximum current Imd or Imu. When the threshold value Ish is exceeded, the drive motor 1
The start point s1 and the end point s2 may be read assuming that 0 is a stop. According to the method of detecting the constraint current Is, it is not necessary to wait for the time limit τ or Tsh, so that the reading timing of the start point s1 and the end point s2 can be further advanced. Example 4. In the first embodiment,
The diagnostic operation was supposed to be performed prior to the normal operation,
The present invention is not limited to this, and may be performed after the end of normal operation, or may be performed at any time by a remote instruction from the maintenance management center 61. Example 5. Although the escalator 1 is applied in the first embodiment, the same can be applied to the moving sidewalk.

[0034]

Since the present invention is configured as described above, it has the following effects. The slack amount diagnosing device for a drive chain of a passenger conveyor according to claim 1 of the present invention reduces the driving force of the drive motor to a low value at which the main drive sprocket does not start until the drive motor is stopped to one side. After rotating one side of the drive chain to make it tense, the direction of rotation is changed to rotate in the opposite direction until it is stopped, making the other side of the drive chain tense, and the rotation of the drive motor rotated in the meantime. The amount of slack in the drive chain is calculated from the number of movements, and when the amount of slack exceeds a predetermined value, an abnormal signal is issued. For this reason, it is possible to omit the on-site work such as removing the floor plate and entering the machine room, and it is possible to easily diagnose the amount of slack of the drive chain.

According to a second aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, when the operation switch for instructing the passenger conveyor to perform a normal operation is operated, this normal operation is performed. The start point and the end point are set prior to the operation, and the slack amount is calculated. Therefore, the diagnosis of the drive chain is performed prior to the normal operation, so that the user is not inconvenienced.

According to a third aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, when the operation switch for instructing the passenger conveyor to perform a normal operation is operated, the normal operation is performed. Prior to, the direction of rotation of the drive motor is switched to the direction opposite to the direction of normal operation designated by the operation switch, and the start point is set by rotating with a low driving force, and then the direction of rotation of the drive motor is operated. The amount of slack is calculated by switching to the direction designated by the switch and setting the end point. Therefore, in addition to not inconvenience the user, it is possible to shift from the diagnostic operation to the normal operation with the drive chain in a tensioned state, and reduce the backlash at the start of the normal operation. It also has the effect of being able to do it.

According to a fourth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, the stop detection means causes the drive electric motor to be started by the start point setting operation means or the end point setting operation means. After that, the elapse of a predetermined time limit is detected, and this detection is detected as a stopped state. Therefore, an effect that the restrained state can be easily detected is also provided.

According to a fifth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, the stop detecting means has a predetermined pulse generation interval generated by the rotation of the drive motor. The fact that the time limit has been exceeded is detected, and this detection is made to be the detection of the stopped state. Since the pulse interval is short and short, the time limit can also be short and short, and the effect of being able to quickly detect the stop of the drive motor is also obtained.

According to a sixth aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor. In the first aspect, the inhibition detecting means detects the restraining current of the drive motor, and the detection is inhibited. This is the detection of the state. For this reason, it is not necessary to wait for a predetermined time limit,
The effect of being able to detect the stoppage of the drive motor more quickly is also achieved.

According to a seventh aspect of the present invention, there is provided a slack amount diagnosing device for a drive chain of a passenger conveyor, wherein the start point and the end point are replaced with the rotational position of the drive motor, and the rotation of the drive machine sprocket is changed. The slack amount of the drive chain is calculated as the moving position. For this reason,
It is possible to eliminate the backlash of the reducer of the drive machine and accurately calculate the amount of slack in the drive chain.

According to an eighth aspect of the present invention, the slack amount diagnosing device for the drive chain of the passenger conveyor is the one for transmitting an abnormal signal to the control center for centrally managing the passenger conveyor. . Therefore, it is possible to diagnose the amount of slack in the drive chain without going to the site where the passenger conveyor is installed.

According to a ninth aspect of the present invention, there is provided a method for diagnosing a slack in a drive chain of a passenger conveyor, wherein the drive motor is rotated in one direction with a driving force lower than that required to start the main drive sprocket. The tension on one side of the drive chain, starting at the point where the drive motor stopped, then rotating the drive motor in the other direction to tension the other side of the drive chain and ending at the point where the drive motor stopped. Then, the slack amount of the drive chain is calculated from the difference between the start point and the end point, and an abnormal signal is issued when the slack amount exceeds a predetermined value. Even in this case, it is possible to omit the on-site work such as removing the floor plate and entering the machine room, and it is possible to easily diagnose the amount of slack of the drive chain.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a slack amount diagnosing device for a drive chain of a passenger conveyor according to a first embodiment of the present invention.

FIG. 2 is an electric circuit connection diagram of the slack amount diagnosing device for the drive chain of the passenger conveyor according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the slack amount diagnosing device for the drive chain of the passenger conveyor according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the main part of the slack amount diagnostic device for the drive chain of the passenger conveyor according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining the operation of the main part of the slack amount diagnostic device for the drive chain of the passenger conveyor according to the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a passenger conveyor showing a conventional method for measuring the amount of slack in a drive chain of the passenger conveyor.

[Explanation of symbols]

1 escalator, 2 steps, 3 steps chain,
4 step chain sprocket, 5 main drive sprocket, 6 drive machine, 7 output shaft, 8 drive machine sprocket, 9 drive chain, 10 drive motor,
11 rotating shaft, 12 brake, 19 rotating plate,
20 pulse counter, 21 diagnostic operation command means,
22 driving force reducing means, 23 starting point setting driving means,
24 stop detection means, 25 start point reading means, 26
Rotation direction switching means, 27 end point setting means, 28 end point reading means, 29 loosening amount calculating means, 30 transmitting means, 31 circuit breaker, 32 converter, 33 smoothing circuit, 34 resistance, 35 switching transistor, 36 inverter, 37 trigger circuit ,
38 base drive circuit, 39 base drive circuit, 41 operation switch, 41s stop switch,
41u UP operation switch, 41d DOWN operation switch, 42 safety circuit, 43 switch, 55
Normal operation speed pattern table, 56 diagnosis operation speed pattern table, 57 input / output device, 58 signal light, 59 communication device, 60 telephone line, 61 maintenance management center.

Claims (9)

[Claims] 1. A drive sprocket mounted on an output shaft of a drive driven by a drive motor to drive a passenger conveyor, and a main drive mounted on a step chain sprocket around which a step chain for circulating a step is wound. In a device for diagnosing the amount of slack in a drive chain that is wound around a sprocket and transmits the power of the drive sprocket to the main drive sprocket, a drive required to start the drive force of the drive motor to start the main drive sprocket. Driving force reducing means for reducing the force to a value lower than the force, braking detecting means for detecting the braking state of the driving electric motor, and driving force reduced by the driving force reducing means for rotating the driving electric motor in one direction. The start point setting operation means for stopping the one side of the drive chain in a tensioned state, and the start point setting operation means. Starting point reading means for reading the turning position of the drive motor as a starting point when the restraint detecting means detects the restrained state by the operation by the turning means, and the turning direction of the drive motor is switched to rotate in the other direction. An end point setting operation means for stopping the other side of the drive chain in a tensioned state, and an end point for reading the turning position of the drive motor as the end point when the stop detection means detects the stop state by the operation by the end point setting operation means. Slack for calculating the amount of slack of the drive chain from the reading means and the number of rotations of the drive motor between the start point read by the start point reading means and the end point read by the end point reading means. Slack amount diagnosis of the drive chain of the passenger conveyor, which is provided with an amount calculating means and a transmitting means for issuing an abnormal signal when the slack amount exceeds a predetermined value. Location. 2. A slack amount is calculated by operating a start point setting operation means and an end point setting operation means prior to the normal operation when an operation switch for instructing the passenger conveyor to perform a normal operation is operated. The slack amount diagnostic device for the drive chain of the passenger conveyor according to claim 1. 3. When the operation switch for instructing the passenger conveyor to perform a normal operation is operated, the rotation direction of the drive motor is switched to a direction opposite to the direction specified by the operation switch prior to the normal operation. The slack amount is calculated by activating the start point setting driving means and then switching the rotation direction of the drive motor to the direction designated by the driving switch and activating the end point setting driving means. The slack amount diagnostic device for the drive chain of the passenger conveyor described. 4. The restraint detecting means detects the elapse of a predetermined time limit after the drive motor is started by the start point setting driving means or the end point setting driving means, and the detection is a detection of the restraining state. 1. A slack amount diagnosing device for a drive chain of a passenger conveyor according to 1. 5. The restraint detection means is adapted to detect that a pulse generation interval generated by the rotation of the drive motor exceeds a predetermined time limit, and the detection is a restraint state detection. The slack amount diagnostic device for the drive chain of the passenger conveyor described. 6. The slack amount diagnosing device for a drive chain of a passenger conveyor according to claim 1, wherein the restraint detection means detects a restraining current of the drive motor, and the detection is a restraint state detection. 7. The slack amount diagnosing device for a drive chain of a passenger conveyor according to claim 1, wherein a starting point for reading a rotational position of a drive machine sprocket is replaced with a starting point for reading a rotational position of a drive motor and an end point reading means. A slack amount diagnosing device for a drive chain of a passenger conveyor which is used as a reading means and an end point reading means. 8. The transmitting means sends an abnormality signal to a management center that centrally manages the passenger conveyor.
The slack amount diagnosing device for the drive chain of the passenger conveyor according to. 9. A drive sprocket attached to an output shaft of a drive driven by a drive motor to drive a passenger conveyor, and a main drive attached to a step chain sprocket around which a step chain for circulating the steps is wound. In a method of diagnosing the amount of slack in a drive chain that is wound around a sprocket and transmits the power of the drive sprocket to the main drive sprocket, the drive motor is more than the drive force required to start the main drive sprocket. Starting point setting step of rotating the driving chain in one direction with a low driving force to tension one side of the driving chain to stop the driving electric motor, and reading the starting position of the driving electric motor stopped by the starting point setting step Step and start the drive motor to start the main drive sprocket An end point setting step of rotating the drive motor in another direction with a driving force lower than the required driving force to strain the other side of the drive chain to stop the drive motor, and the rotation of the drive motor stopped by the end point setting step. The slack amount of the drive chain is calculated by calculating the difference value between the end point reading step of reading the position, the rotation position read in the start point reading step, and the rotation position read in the end point reading step. A slack amount diagnosing method for a drive chain of a passenger conveyor, comprising: a slack amount calculating step; and a transmitting step for issuing an abnormal signal when the slack amount exceeds a predetermined value.